For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. Other things equal, lower gas pressure means higher-quality vacuum. The quality of a partial vacuum refers to how closely it approaches a perfect vacuum. The Latin term in vacuo is used to describe an object that is surrounded by a vacuum. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure. Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space.
An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure.
The word is derived from the Latin adjective vacuus for "vacant" or " void".
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